Connection wire structure of direct light bar and connection method thereof

ABSTRACT

The present invention relates to a connection wire structure of a direct light bar and a connection method thereof. The connection wire structure of the direct light bar includes a plurality of light bars and connection wires, and a circuit board. Each light bar includes a wiring board that includes a first exposed copper zone that includes a hole to serve as a circuit connection contact. The circuit board includes a second exposed copper zone that includes a hole to serve as a circuit connection contact. Each of the connection wires has two ends to each of which a copper ring is connected. The two copper rings of each of the connection wires are respectively connected to the first exposed copper zones or the second exposed copper zones corresponding thereto by coupling pieces so as to establish electrical connection. A connection method of the direct light bar is also provided.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the technical field of backlighting,and in particular to a connection wire structure of a direct light barand a connection method thereof.

2. The Related Arts

The fast progress of flat display technology in recent years makesliquid crystal displays (LCDs) widely used in various informationappliances, communication devices, and consumer products due to variousadvantages of for example compact size, light weight, high imagequality, and low driving voltage. The liquid crystal that is containedin a liquid crystal display panel of an LCD does not posses any lightemitting characteristic and thus, a light source device, such as abacklight module, which supplies light of sufficient illumination anduniform distribution to the liquid crystal display panel, must beprovided to the liquid crystal display panel of LCD in order to effectadjustment of displaying illumination of the LCD. According to thelocation of the backlight module relative to the liquid crystal displaypanel, the backlight module is classified as a direct backlight modulethat is installed on the back side of the liquid crystal panel and aside-edge backlight module that is arranged at the circumference of theliquid crystal panel.

The fast development of backlighting technique for backlight modulebrings light-emitting diode (LED) based backlighting intoindustrialization, gradually taking the place of cold cathodefluorescent lamp (CCFL) as the main stream of backlight source forbacklight module. Consequently, LEDs are gradually used in the directbacklight module as a backlight source to replace the fluorescent lamps.

In a backlight module that uses LED as a backlight source, LED chips aremounted to a flexible printed circuit (FPC) or a printed circuit board(PCB) to make an LED light bar that then serves as a backlight source tobe incorporated in a backlight module of liquid crystal display panel.For a conventional direct backlight module, a large number of light barsare used and they are connected to each other through terminals. Asshown in FIG. 1, a schematic view of a conventional connection wirestructure of direct backlight module is given. The conventionalconnection wire structure of direct backlight module comprises aplurality of light bars 100, a plurality of wires 200, a circuit board300, a female connector 301 mounted to the circuit board 300, a femaleconnector 103 mounted to each of the light bar 100 throughpick-and-place operation, and a plurality of male connectors 201 forconnecting the connection wires 200. The male connector 201 are bondedto the connection wires 200 by using a pick-and-place machine in such away that each male connector 201 is connected between two connectionwires 200 to thereby sequentially connect all the male connectors 201and the all the connection wires 200 together to form a wire harness.Each light bar 100 comprises a wiring board 102 and a plurality of LEDchips 101 mounted to the wiring board 102. The wiring board 102 can bean FPC or a PCB. The light bar 100 also comprises the female connector103 that is mounted thereto through pick-and-place operation. Throughmale-female mating engagement in a one-to-one manner, between the maleconnectors 201 and the female connectors 103 and the female connector301, the light bars 100, the connection wires 200, and the circuit board300 are connected to form a loop and thus achieving the backlightingfunction. This arrangement suffers a severe drawback that increasing ordecreasing one light bar 100 would require an increase or decrease ofthe quantity of male connectors 201 used. Since the male connectors 201and the connection wires 200 are securely bonded together throughpick-and-place operation, such a known arrangement would lead to theconclusion of additional pick-and-place operation must be carried out tomake the additional connection wire 200. This causes a waste of wirecost and the shareability of the wire is poor.

SUMMARY OF THE INVENTION

Thus, an object of the present invention is to provide a novelconnection wire structure of a direct light bar and a connection methodthereof, which meets the need of shareability of connection wires whenthe number of light bars is increased or decreased.

To achieve the object, the present invention provides a connection wirestructure of a direct light bar, which comprises a plurality of lightbars, a plurality of connection wires, and a circuit board. Each of thelight bars comprises a wiring board that comprises a first exposedcopper zone that comprises a hole to serve as a circuit connectioncontact. The circuit board comprises a second exposed copper zone thatcomprises a hole to serve as a circuit connection contact. Each of theconnection wires has two ends to each of which a copper ring isconnected. The two copper rings of each of the connection wires arerespectively connected to the first exposed copper zones or the secondexposed copper zones corresponding thereto by coupling pieces so as toestablish electrical connection.

Wherein, the coupling pieces comprise bolts.

Wherein, the coupling pieces comprise pins.

Wherein, the copper rings are connected to the two ends of each of theconnection wires through pick-and-place operation.

The present invention also provides a connection method of direct lightbar, comprising the following steps:

(1) mounting a copper ring to each of two ends of each connection wire;

(2) forming a first exposed copper zone that comprises a hole in awiring board of each light bar to serve as a circuit connection contact;

(3) forming a second exposed copper zone that comprises a hole in acircuit board to serve as a circuit connection contact; and

(4) connecting the two copper rings of each connection wire by couplingpieces to the holes of the first exposed copper zones or the secondexposed copper zone corresponding thereto to establish circuitconnection.

Wherein, the coupling pieces comprise bolts.

Wherein, the coupling pieces comprise pins.

Wherein, the copper rings are connected to the two ends of each of theconnection wires through pick-and-place operation.

The present invention provides a connection wire structure of a directlight bar and a connection method thereof, which meet the need of wiresharing in case of increase or decrease of the number of light bars.When the number of light bars is increased or decreased, it can beeasily handled by increasing or decreasing one copper ring mountedconnection wire. There is no need to carry out an additionalpick-and-place operation of making the connection wire harness so thatthe cost and the pick-and-place operation time are reduced therebyrealizing shareability of wires of various types and various quantities.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution, as well as beneficial advantages, will beapparent from the following detailed description of an embodiment of thepresent invention, with reference to the attached drawings. In thedrawings:

FIG. 1 is a schematic view showing a conventional connection wirestructure of a direct light bar;

FIG. 2 is schematic view showing a preferred embodiment of connectionwire structure of a direct light bar according to the present invention;

FIG. 3 is a cross-sectional view taken in a conduction site of a lightbar after the assembling of the embodiment of FIG. 2; and

FIG. 4 is a flow chart showing a preferred embodiment of a connectionmethod of the direct light bar according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 2, a schematic view of a preferred embodiment ofconnection wire structure of a direct light bar according to the presentinvention is shown. The connection wire structure of direct light baraccording to the present invention comprises a plurality of light bars1, a plurality of connection wires 2, and a circuit board 3. Each of thelight bars 1 comprises a wiring board 12 and a plurality oflight-emitting diode (LED) chips 11 mounted to the wiring board 12. Thewiring board 12 can be a flexible printed circuit (FPC) or a printedcircuit board (PCB). The wiring board 12 of each light bar 1 comprises aholed exposed copper zone 13 serving as a circuit connection contact.The circuit board 3 comprises a holed exposed copper zone 31 serving asa circuit connection contact. Each connection wire 2 has two ends eachconnected with a copper ring 21. To assemble, according a predeterminedlight bar circuit, the copper rings 21 of each connection wire 2 arerespectively connected by coupling pieces to the holes of thecorresponding exposed copper zones 31, 13 for conduction of circuit. Thecoupling pieces can be bolts or pins. The copper rings 21 can be mountedto the two ends of each connection wire 2 by a pick-and-place machine.

Referring to FIG. 3, a cross-sectional view taken in a conduction siteof a light bar after the assembling of the embodiment of FIG. 2 isgiven. The coupling piece 4 is inserted into the corresponding copperring 21 and the hole centered in the exposed copper zone 13 of thewiring board 12 to establish electrical connection.

Referring to FIG. 4, a flow chart showing a preferred embodiment ofconnection method of the direct light bar according to the presentinvention is given. The connection method of direct light bar accordingto the present invention comprises the following steps:

Step 10: mounting a copper ring to each of two ends of each connectionwire;

Step 20: forming a first exposed copper zone that comprises a hole in awiring board of each light bar to serve as a circuit connection contact;

Step 30: forming a second exposed copper zone that comprises a hole in acircuit board to serve as a circuit connection contact; and

Step 40: connecting the two copper rings of each connection wire bycoupling pieces to the holes of the first exposed copper zones or thesecond exposed copper zone corresponding thereto to establish circuitconnection.

Compared to the conventional way of connection, the connection methodaccording to the present invention omits the male connectors that aremounted to connection wires and also eliminates the female connectorsthat are mounted to the circuit board and the light bar so that the costis greatly saved. A copper ring is mounted to each of two ends of eachconnection wire and an exposed copper zone that comprises a hole isformed on the site at an end of the circuit board where the femaleconnector was originally located. A center of the copper ring of theconnection wire is set alignment with the hole of the exposed copperzone at the end of the circuit board and a pin or a bolt is applied tofix them together to establish electrical connection.

In summary, the present invention provides a connection wire structureof direct light bar and a connection method thereof, which meet the needof wire sharing in case of increase or decrease of the number of lightbars. When the number of light bars is increased or decreased, it can beeasily handled by increasing or decreasing one copper ring mountedconnection wire. There is no need to carry out an additionalpick-and-place operation of making the connection wire harness so thatthe cost and the pick-and-place operation time are reduced therebyrealizing shareability of wires of various types and various quantities.

Based on the description given above, those having ordinary skills ofthe art may easily contemplate various changes and modifications of thetechnical solution and technical ideas of the present invention and allthese changes and modifications are considered within the protectionscope of right for the present invention.

What is claimed is:
 1. A connection wire structure of a direct lightbar, comprising a plurality of light bars, a plurality of connectionwires, and a circuit board, each of the light bars comprising a wiringboard that comprises a first exposed copper zone that comprises a holeto serve as a circuit connection contact, the circuit board comprising asecond exposed copper zone that comprises a hole to serve as a circuitconnection contact, each of the connection wires having two ends to eachof which a copper ring is connected, the two copper rings of each of theconnection wires being respectively positioned on and in alignment withthe first exposed copper zones or the second exposed copper zonescorresponding thereto and are connected thereto by coupling pieces so asto establish electrical connection between each of the two copper ringsand the corresponding first or second exposed copper zone, whereby thecircuit board and the wiring boards of the light bars are electricallyconnected by the connection wires.
 2. The connection wire structure of adirect light bar as claimed in claim 1, wherein the coupling piecescomprise bolts.
 3. The connection wire structure of a direct light baras claimed in claim 1, wherein the coupling pieces comprise pins.
 4. Theconnection wire structure of a direct light bar as claimed in claim 1,wherein the copper rings are connected to the two ends of each of theconnection wires through pick-and-place operation.
 5. A connection wirestructure of a direct light bar, comprising a plurality of light bars, aplurality of connection wires, and a circuit board, each of the lightbars comprising a wiring board that comprises a first exposed copperzone that comprises a hole to serve as a circuit connection contact, thecircuit board comprising a second exposed copper zone that comprises ahole to serve as a circuit connection contact, each of the connectionwires having two ends to each of which a copper ring is connected, thetwo copper rings of each of the connection wires being respectivelypositioned on and in alignment with the first exposed copper zones orthe second exposed copper zones corresponding thereto and are connectedthereto by coupling pieces so as to establish electrical connectionbetween each of the two copper rings and the corresponding first orsecond exposed copper zone, whereby the circuit board and the wiringboards of the light bars are electrically connected by the connectionwires; wherein the coupling pieces comprise bolts or pins; and whereinthe copper rings are connected to the two ends of each of the connectionwires through pick-and-place operation.